USART INTERFACE

USART's are used for generic serial communication between AVR32 processors and peripherals.

Three USARTs are available on product. The USART0 and USART1 are connected to external DB9 connectors and USART2 and USART3 are accessible through expansion headers.

Peripherals and connectors

Signals

Signal DescriptionPeripheral and connectorsAvailable on GPIO
U0_RXReceive serial data(1),(5) PA 0
U0_TXTransmit serial data(1),(5) PA 1
U0_CTSClear to send(1),(5) PA 4
U0_RTSRequest to send(1),(5) PA 3
U0_CLKSerial clock(5) PA 2
U1_RXReceive serial data(1),(5) PA 5
U1_TXTransmit serial data(1),(5) PA 6
U1_CTSClear to send(1),(5) PA 9
U1_RTSRequest to send(1),(5) PA 8
U1_CLKSerial clock(5) PA 7
U1_RIRing indicator(1),(5) PB 26
U1_DTRData Terminal Ready(1),(5) PB 25
U1_DSRData Set Ready(1),(5) PB 24
U1_DCDData Carrier Detect(1),(5) PB 23
U2_RXReceive serial data(5) PB 29
U2_TXTransmit serial data(5) PB 30
U2_CLKSerial clock(5) PB 31
U3_RXReceive serial data(5) PB 10
U3_TXTransmit serial data(5) PB 11
U3_CLKSerial clock(5) PB 4